Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 487
diskslike E (Fig. 2), and twoarms like F (Fig. 2). Fromthese twelve pieces mustnow be made four groovedwheels, two controllersfor operating the sema-phore arms, and twosemaphore arms. To make a controller,glue one D between twoEs. To make an arm, glue one D between oneE and one F. When the arms are… … FIG.M- 19I4-] NATURE AND SCIENCE FOR YOUNG FOLKS 945 While these are setting in a vise or underweights, you may be constructing the supportshown in Figure i. The upright, B, should bekept about one inch back from thefront of the base-board, A, and eachof the screw-eyes must be so placed asto be in…
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